Rosa (Shrub) 'Knock Out'
Knock Out Shrub Rose
The rose is the queen of flowers, the most loved and widely planted shrub in all temperate parts of the world. More than 14,000 varieties are grown. Although mostly deciduous, roses can be evergreen in mild climates. Their stems, sometimes quite prickly, may be erect, arching, trailing, or scrambling. Leaves are divided into three, five, or seven leaflets, usually with toothed margins.
For an overview about roses and their care, click here.Rosa (Shrub)
Shrub roses bloom prolifically over a long season and have abundant disease-resistant foliage. Most look good with little or no pruning. Loose categories are listed below.
Hybrid musk shrub roses. Developed a century ago from a descendant of the musk rose (R. moschata), these 6- to 8-ft.-tall shrubs or small climbers perform well in dappled or partial shade as well as in sun. Most have fragrant, clustered flowers, but tend not to flower prolifically in mild climates.
Hardy shrub roses. From Canada and the Midwest, these are bred to survive northern and Rocky Mountain winters. Some resemble floribundas and grandifloras; their ancestries include hardy species, floribunda, and hybrid teas. They have “country” names like ‘Country Dancer’ and ‘Prairie Princess’. Others, named for explorers like ‘John Cabot’ and ‘William Baffin’, are mostly large shrubs to small climbers descended in part from R. rugosa.
Miscellaneous shrub roses. Of complex or unknown ancestry, these include well known varieties such as ‘All That Jazz’, ‘Knock Out’, and ‘Sally Holmes’.
Trademarked shrub roses. These are “families” to which new varieties can be added over time. Some of the most popular follow.
The David Austin English roses were developed from various old roses (albas, centifolias, gallicas) crossed with modern roses. These repeat-flowering roses capture the lovely old rose forms and fragrances, and come in a range of colors otherwise found only in today’s hybrid tea roses. They range from low shrubs to climbers. Many have Chaucerian or Shakespearean names, though the three most popular—‘Abraham Darby’, ‘Graham Thomas’, and ‘Mary Rose’—commemorate, respectively, an English industrialist, a noted English horticulturist, and the flagship of Henry VIII’s fleet.
The French house of Meilland has produced the Romantica roses, most of which are named for well known figures in European arts and letters (such as ‘Yves Piaget’); the color range is contemporary, but the full-petaled flowers recall the early hybrid teas and hybrid perpetuals. The trademarked Meidiland family of roses (including ‘Pink Meidiland’ and ‘White Meidiland’) are mostly somewhat billowy shrubs.
Another French firm, Guillot (famous for originating the first hybrid tea rose), offers Generosa roses; these are similar to the English roses in variability and old rose style. ‘Martine Guillot’, with cupped, creamy white blooms blushed with peach, is an example.
Renaissance roses, from the Danish house of Poulsen, are akin to floribundas, with an emphasis on vigor, disease resistance, abundant bloom, and modern flower form.
Flower Carpet is a family of ground cover roses bred by noted German rosarian Werner Noack for easy care and a long season of prolific bloom.
Very popular shrub rose with excellent disease resistance and neon red flowers. Grows 4-6 ft. high and wide.
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